Hi… Alan Warrell gave me these details:
There are a couple of UK companies which supply marine lift off hinges, they are:
Also I bought some from:
Yachting Sports Nauticat Repairs, Southampton
Derek or James
Mobile 07768 306255
Work 023 8045 6050
I am busy cleaning all mine on my 331 with vinegar and then putting Marine Grease / Lube on them.
Hope that helps.
Good Dog 331